He never knew that he would be stuck on earth forever because of his stupid mistake that he did in hell. But little did he know that he would meet his first so-called love on earth? "I dont know why, but I swear I'll protect you. Until the day you'll die" - Kim Taehyung "He seems nice. I wonder if he likes me too" -Choi Luna Kim Taehyung, a demon that was sent to earth as a punishment from breaking the law of Hell. One day, he was called by someone and accidently made a promise to that person to work under them. He regrets his life and his mistake. He never sees good about his 'new' life after he died until one day he met a girl. Choi Luna, a girl who has family problems, lives a lone in her small studio apartment. She's now working as a photographer after she graduated from university. She thinks that she's not lovable and worth it after her five years boyfriend was found out cheating on her for two years. She's also never gets loved by her own father. But her life changed after she met this boy at a park while walking at night. Thanks for her being a crybaby and need some fresh air that night, she finally found the one for her. Will the truth be broke? Will Choi Luna accept Kim Taehyung even when she already knows that he is a demon?